a. What are the differences among sequential access, direct access, and random a
ID: 3718569 • Letter: A
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a. What are the differences among sequential access, direct access, and random access? b. Discuss memory hierarchy pyramid. c. Discuss the organization and structure of cache memory with the main memory. d. What are the elements of Cache design? e. Describe Pentium 4 cache design and organization and compare with ARM cache and write buffer 7. organization f. The Intel 80486 has an on-chip, unified cache. It contains 8 Kbytes and has a four-way set-associative organization and a block length of four 32-bit words. The cache is organized into 128 sets. There is a single "line valid bit" and three bits, BO, B1, and B2 (the "LRU" bits), per line. On a cache miss, the 80486 reads a 16-Explanation / Answer
Answer)
7 A) The difference between the sequential access, direct access and random access.
When accessing the data sequentially is referred as sequential access where as accessing the same data in a random order is Random access.
In sequential access the memory is organized into data units.
A shared read write access when specified in a linear access is called as direct access.
Accessing the memory location randomly is Random access.
b) The memory hierarchy pyramid is used to separate the computer storage with respect to the response time in a hierarchical manner. The levels have performance and the controlling techniques.
c) The organization and structure of cache memory are as follows:
The cache memory is in between the CPU and the main memory. When a data is being fetched it is initially fetched from the main memory but this gets stored in the cache memory with respect to the number of hits made to that data. Next time when the data gets called then it is called directly from the cache as a result of which the search result is fast.
d) The elements of cache designs are as follows:
Cache address, cache size, mapping function, replacement algorithm, write policy, line size and number of cache.
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